Door lock



FIG. 1 is a perspective view of a door lock showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a top plan view thereof.

The elements shown in broken lines are included for the purpose of illustrating environment and form no part of the claimed design. 

We claim the ornamental design for a door lock, as shown and described. 